Table Of ContentANSI/AWWA B505-12
(Revision of ANSI/AWWA B505-05)
The Authoritative Resource on Safe Water®
AWWA Standard
Disodium Phosphate,
Anhydrous
SM
Effective date: Aug. 1, 2012.
First edition approved by AWWA Board of Directors Jan. 25, 1988.
This edition approved Jan. 22, 2012.
Approved by American National Standards Institute June 1, 2012.
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Copyright © 2012 American Water Works Association. All Rights Reserved.
AWWA Standard
This document is an American Water Works Association (AWWA) standard. It is not a specification. AWWA standards describe
minimum requirements and do not contain all of the engineering and administrative information normally contained in specifi-
cations. The AWWA standards usually contain options that must be evaluated by the user of the standard. Until each optional
feature is specified by the user, the product or service is not fully defined. AWWA publication of a standard does not constitute
endorsement of any product or product type, nor does AWWA test, certify, or approve any product. The use of AWWA standards
is entirely voluntary. This standard does not supersede or take precedence over or displace any applicable law, regulation, or
codes of any governmental authority. AWWA standards are intended to represent a consensus of the water supply industry that
the product described will provide satisfactory service. When AWWA revises or withdraws this standard, an official notice of
action will be placed on the first page of the Official Notice section of Journal - American Water Works Association. The action
becomes effective on the first day of the month following the month of Journal - American Water Works Association publication
of the official notice.
American National Standard
An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American
National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an
American National Standard does not in any respect preclude anyone, whether that person has approved the standard or not,
from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. Ameri-
can National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. Producers of goods
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promotional materials or on tags or labels that the goods are produced in conformity with particular American National Standards.
Caution notiCe: The American National Standards Institute (ANSI) approval date on the front cover of this standard indicates
completion of the ANSI approval process. This American National Standard may be revised or withdrawn at any time. ANSI
procedures require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of
ANSI approval. Purchasers of American National Standards may receive current information on all standards by calling or writ-
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ISBN-13, print: 978-1-58321-895-2 eISBN-13, electronic: 978-1-61300-191-2
ISBN-10, print: 1-58321-895-5 eISBN-10, electronic: 1-61300-191-6
All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopy, recording, or any information or retrieval system, except in the form of brief excerpts or
quotations for review purposes, without the written permission of the publisher.
Copyright © 2012 by American Water Works Association
Printed in USA
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Committee Personnel
The AWWA Standards Committee on Scale and Corrosion-Control Chemicals, which reviewed
and approved this standard, had the following personnel at the time of approval:
Robert A. Ryder, Chair
General Interest Members
J.H. Bambei Jr.,* Denver Water, Denver, Colo. (AWWA)
M.P. Chaulk, CBCL Limited Consultants Ltd., Halifax Regional Municipality, N.S. (AWWA)
M.S. McFadden, HDR Engineering Inc., Bellevue, Wash. (AWWA)
D. Orozco, Cole & Associates Engineers, Safety Harbor, Fla. (AWWA)
R.A. Ryder, Kennedy/Jenks Consultants, San Francisco, Calif. (AWWA)
S.J. Posavec,* Standards Group Liaison, AWWA, Denver, Colo. (AWWA)
R. Vaidya, Camp Dresser & McKee, Tampa, Fla. (AWWA)
Producer Members
H.T. Belcher Jr., Corrtrac Systems Corporation, Currituck, N.C. (AWWA)
C.P. Principi, Carus Corporation, Belmont, N.C. (AWWA)
V.J. Verdone, Pristine Water Solutions Inc., Waukegan, Ill. (AWWA)
Y. Zhang, DXV Water Technologies Inc., Tustin, Calif. (AWWA)
User Members
E.J. Kiefer, North Shore Water Commission, Milwaukee, Wis. (AWWA)
R.M. Powell, Pinellas County Utilities, Largo, Fla. (AWWA)
J.C. Thurrott, City of Daytona Beach, Daytona Beach, Fla. (AWWA)
* Liaison, nonvoting
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Contents
All AWWA standards follow the general format indicated subsequently. Some variations from this
format may be found in a particular standard.
SEC. PAGE SEC. PAGE
Foreword 2 References ........................................ 2
I Introduction. ................................... vii
3 Definitions ....................................... 2
I.A Background ..................................... vii
4 Requirements
I.B History ............................................ vii
4.1 Physical Requirements ....................... 3
I.C Acceptance ...................................... vii
4.2 Chemical Requirements .................... 3
II Special Issues. ................................. viii
4.3 Impurities .......................................... 4
II.A Storage and Handling
Precautions ............................... viii
5 Verification
III Use of This Standard ........................ ix
5.1 Sampling ........................................... 4
III.A Purchaser Options and
5.2 Test Procedures ................................. 5
Alternatives ................................ ix
5.3 Notice of Nonconformance ............... 8
III.B Modification to Standard ................. ix
6 Delivery
IV Major Revisions ................................ ix
6.1 Marking ............................................ 8
V Comments ....................................... ix
6.2 Packaging and Shipping .................... 9
Standard 6.3 Affidavit of Compliance or
1 General ............................................. 1 Certified Analysis ........................ 9
1.1 Scope ................................................ 1
1.2 Purpose ............................................. 1
1.3 Application ........................................ 1
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Foreword
This foreword is for information only and is not a part of ANSI*/AWWA B505.
I. Introduction.
I.A. Background. Disodium phosphate, anhydrous, is a manufactured product
obtained by combining a comparatively pure chemical, soda ash (Na CO ) or caustic
2 3
soda (NaOH), with phosphoric acid (H PO ). The resulting product is dried, sized,
3 4
and packaged.
Disodium phosphate, anhydrous, is a white, crystalline solid, commercially avail-
able in granular and powder forms. A solution of 1 lb/gal (0.12 kg/L) has a specific
gravity of approximately 1.1 at 25°C (77°F).
For information on safety, refer to material safety data sheets (MSDS) available
from the supplier or manufacturer.
I.B. History. In 1985, the AWWA Standards Committee on Scale and
Corrosion-Control Chemicals recognized the need for a standard for disodium
phosphate, anhydrous, used as a corrosion-control product in the treatment of potable
water. The AWWA Standards Council authorized development of the standard on
Nov. 18, 1985, and the first edition was approved on Jan. 25, 1988. The second
edition of the standard was approved on Jan. 22, 1995. The third edition of the
standard was approved on Jan. 21, 2001. The fourth edition of ANSI/AWWA B505
was approved by the AWWA Board of Directors on June 12, 2005. This edition was
approved on Jan. 22, 2012.
I.C. Acceptance. In May 1985, the US Environmental Protection Agency
(USEPA) entered into a cooperative agreement with a consortium led by NSF
International (NSF) to develop voluntary third-party consensus standards and a
certification program for direct and indirect drinking water additives. Other members
of the original consortium included the Water Research Foundation† (formerly
AwwaRF), and the Conference of State Health and Environmental Managers
(COSHEM). The American Water Works Association and the Association of State
Drinking Water Administrators (ASDWA) joined later.
In the United States, authority to regulate products for use in, or in contact with,
drinking water rests with individual states.‡ Local agencies may choose to impose
* American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036.
† Water Research Foundation, 6666 West Quincy Avenue, Denver, CO 80235
‡ Persons outside the United States should contact the appropriate authority having jurisdiction.
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requirements more stringent than those required by the state. To evaluate the health
effects of products and drinking water additives from such products, state and local
agencies may use various references, including two standards developed under the
direction of NSF, NSF*/ANSI 60, Drinking Water Treatment Chemicals—Health
Effects, and NSF/ANSI 61, Drinking Water System Components—Health Effects.
Various certification organizations may be involved in certifying products in accor-
dance with NSF/ANSI 60. Individual states or local agencies have authority to accept
or accredit certification organizations within their jurisdiction. Accreditation of certi-
fication organizations may vary from jurisdiction to jurisdiction.
Annex A, “Toxicology Review and Evaluation Procedures,” to NSF/ANSI 60 does
not stipulate a maximum allowable level (MAL) of a contaminant for substances not
regulated by a USEPA final maximum contaminant level (MCL). The MALs of an
unspecified list of “unregulated contaminants” are based on toxicity testing guidelines
(noncarcinogens) and risk characterization methodology (carcinogens). Use of Annex A
procedures may not always be identical, depending on the certifier.
ANSI/AWWA B505 addresses additives requirements in Sec. 4.3.3 of the standard.
The transfer of contaminants from chemicals to processed water or to residual solids is
becoming a problem of greater concern. The language in Sec. 4.3.3 is a recommenda-
tion only for direct additives used in the treatment of potable water to be certified by
an accredited certification organization in accordance with NSF/ANSI 60 Drinking
Water Treatment Chemicals—Health Effects. However, users of the standard may opt
to make this certification a requirement for the product. Users of this standard should
consult the appropriate state or local agency having jurisdiction in order to
1. Determine additives requirements, including applicable standards.
2. Determine the status of certifications by parties offering to certify products
for contact with, or treatment of, drinking water.
3. Determine current information on product certification.
II. Special Issues.
II.A. Storage and Handling Precautions. Disodium phosphate, anhydrous, is
relatively hygroscopic and will absorb water. It must be stored under dry conditions.
Exposure to humidity produces a caked condition. This results in poor flow and caking
that interferes with the rate of dilution and effectiveness of the product. Refer to the
MSDS available from the manufacturer or supplier for additional information.
* NSF International, 789 N. Dixboro Road, Ann Arbor, MI 48105.
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III. Use of This Standard. It is the responsibility of the user of an AWWA
standard to determine that the products described in that standard are suitable for use
in the particular application being considered.
III.A. Purchaser Options and Alternatives. The following information should be
provided by the purchaser.
1. Standard used—that is, ANSI/AWWA B505, Standard for Disodium
Phosphate, Anhydrous, of latest revision.
2. Whether compliance with NSF/ANSI 60, Drinking Water Treatment
Chemicals—Health Effects, is required.
3. Details of other federal, state, or provincial, and local requirements
(Section 4).
4. Physical form(s) and quantity (Sec. 4.1.1).
5. Specific maximum impurity content limits, if required (Sec. 4.3).
6. Whether the purchaser will reject product from containers or packaging
with missing or damaged seals. The purchaser may reject product from bulk containers
or packages with missing or damaged seals unless the purchaser’s tests of representative
samples, conducted in accordance with Sec. 5.2, demonstrate that the product meets
the standard. Failure to meet the standard or the absence of, or irregularities in, seals
may be sufficient cause to reject a shipment.
7. Form of shipment—bulk or package, type, and size of container (Sec. 6.2).
8. Whether alternative security measures have been adopted to replace or aug-
ment the security measures set out in Sec. 6.2.3 and 6.2.4.
9. Size and type of container to be used (Sec. 6.2).
10. Affidavit of compliance or certified analysis, or both, if required (Sec. 6.3).
III.B. Modification to Standard. Any modification of the provisions, definitions,
or terminology in this standard must be provided by the purchaser.
IV. Major Revisions. Major changes made to the standard in this revision
include the following:
1. Inclusion of a requirement for compliance with the Safe Drinking Water Act
and other federal regulations (Section 4).
2. Inclusion of a requirement for tamper-evident packaging (Sec. 6.2.3
and 6.2.4).
V. Comments. If you have any comments or questions about this standard,
please call AWWA Engineering and Technical Services at 303.794.7711, FAX at
303.795.7603, write to the department at 6666 West Quincy Avenue, Denver, CO
80235-3098, or e-mail at [email protected].
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